*{box-sizing:border-box}html{font-size:16px}body{margin:0;color:var(--site-text);background:var(--site-bg);font-family:"Microsoft YaHei",system-ui,sans-serif;line-height:1.7}a{color:var(--site-blue);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}h1,h2,h3{line-height:1.25}h1{font-size:2.2rem}h2{font-size:1.5rem}.container{width:min(calc(100% - 40px),var(--site-width));margin-inline:auto}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:1rem;top:1rem;z-index:99;background:#fff;padding:.5rem}.section{padding:3rem 0}.page-hero{padding:3.5rem 0;background:linear-gradient(120deg,#e9f3ff,#fff)}.eyebrow{color:var(--site-blue);font-weight:bold}.empty-state{color:var(--site-muted)}